Related: Episodes

Examine the dangerous rivalry between that has plunged the Middle East into sectarian war. From revolution in Iran, reaction Saudi Arabia and wars in Afghanistan, Lebanon and Iraq, see how religion and power politics drive perpetual conflict.

See part two of a special series about how two rivals have plunged the Middle East into sectarian war. While Iran extends its power from Iraq into Syria and Lebanon, Saudi Arabia is making a stand in Yemen, with deadly consequences for the region.

Investigate a slew of killings linked to the MS-13 gang and the crackdown that swept up immigrant teens. Some 25 bodies have surfaced since 2016. Law enforcement is trying to stop the gang, but some teens have been unlawfully detained in the process.